Broadband polarization/mode insensitive 3-dB optical coupler for silicon photonic switches

Xu, Heming; Zhang, Guowu; Mojaver, Hassan Rahbardar; Liboiron-Ladouceur, Odile

doi:10.1364/oe.486454

Cited by 7 publications

(3 citation statements)

References 33 publications

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“…A directional coupler fully suspended in air can serve as a basic building block for large-scale silicon photonic micro-electromechanical system circuits [106]. Polarizationindependent splitters can be constructed using the directional coupler principle, as we have already discussed for y-branches [107]. In 2023, a multi-output 3D, multi-output, 1xM directional coupler-based splitter was proposed [108].…”

Section: Directional Couplermentioning

confidence: 99%

Integrated Photonic Passive Building Blocks on Silicon-on-Insulator Platform

Amanti,

Andrini,

Armani

et al. 2024

Photonics

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Integrated photonics on Silicon-On-Insulator (SOI) substrates is a well developed research field that has already significantly impacted various fields, such as quantum computing, micro sensing devices, biosensing, and high-rate communications. Although quite complex circuits can be made with such technology, everything is based on a few ’building blocks’ which are then combined to form more complex circuits. This review article provides a detailed examination of the state of the art of integrated photonic building blocks focusing on passive elements, covering fundamental principles and design methodologies. Key components discussed include waveguides, fiber-to-chip couplers, edges and gratings, phase shifters, splitters and switches (including y-branch, MMI, and directional couplers), as well as subwavelength grating structures and ring resonators. Additionally, this review addresses challenges and future prospects in advancing integrated photonic circuits on SOI platforms, focusing on scalability, power efficiency, and fabrication issues. The objective of this review is to equip researchers and engineers in the field with a comprehensive understanding of the current landscape and future trajectories of integrated photonic components on SOI substrates with a 220 nm thick device layer of intrinsic silicon.

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Section: Directional Couplermentioning

confidence: 99%

Integrated Photonic Passive Building Blocks on Silicon-on-Insulator Platform

Amanti,

Andrini,

Armani

et al. 2024

Photonics

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“…On the other hand, the BW obtained from the measurement is not as wide as the one in the simulation owing to the limitations of the light source used. Table 1 lists the performance of the fabricated polarization-insensitive mode-order converters (PIMOCs) [4,9] , polarization-insensitive power splitters (PIPSs) [12,14] , and polarization-insensitive mode-order converting power splitter. As illustrated in Table 1, compared with other devices, our PIMCPS can have a compact size, a broad BW, a relatively small IL, a low CT, and an excellent PU.…”

Section: Fabrication and Characterizationmentioning

confidence: 99%

“…In recent years, silicon mode-order converters based on different structures, including the planar metasurfaces [4] , dielectric slots [5] , asymmetric tapers and subwavelength gratings (SWGs) [6] , photonic crystal waveguides [7] , and SWGs assisted with Mach-Zehnder interferometers [8] , have been reported. Similarly, silicon-based optical power splitters using various structures, including a multimode interference (MMI) coupler [9] , asymmetrical directional couplers and a Y-branch [10] , a photonic crystal-like structure [11,12] , a subwavelength grating structure [13] , and an adiabatic coupler [14] , have also been presented. However, to achieve the mode converting and splitting operations simultaneously, it is often necessary to cascade the mode-order converter with the optical power splitter, resulting in a large footprint.…”

Section: Introductionmentioning

confidence: 99%

Ultra-compact and broadband polarization-insensitive mode-order converting power splitter

Chen,

Yao,

Wang

et al. 2024

中国光学快报

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A polarization-insensitive mode-order converting power splitter using a pixelated region is presented and investigated in this paper. As TE 0 and TM 0 modes are injected into the input port, they are converted into TE 1 and TM 1 modes, which evenly come out from the two output ports. The finite-difference time-domain method and direct-binary-search optimization algorithm are utilized to optimize structural parameters of the pixelated region to attain small insertion loss, low crosstalk, wide bandwidth, excellent power uniformity, polarization-insensitive property, and compact size. Experimental results reveal that the insertion loss, crosstalk, and power uniformity of the fabricated device at 1550 nm are 0.57, −19.67, and 0.094 dB in the case of TE polarization, while in the TM polarization, the relevant insertion loss, crosstalk, and power uniformity are 0.57, −19.40, and 0.11 dB. Within a wavelength range from 1520 to 1600 nm, for the fabricated device working at TE polarization, the insertion loss, crosstalk, and power uniformity are lower than 1.39, −17.64, and 0.14 dB. In the case of TM polarization, we achieved an insertion loss, crosstalk, and power uniformity less than 1.23, −17.62, and 0.14 dB.

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Compact, Scalable, Fast‐Response Multimode 2 × 2 Optical Switch Based on Inverse Design

Sun,

Tong,

Yang

et al. 2024

Laser & Photonics Reviews

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Mode‐division multiplexing (MDM) introduces a new dimension to on‐chip optical interconnection, where the multimode optical switch is one of the core components. However, researchers are still struggling to reduce the chip size and response time, despite great efforts being made. Here, a compact, scalable, fast‐response multimode 2 × 2 switch supporting four modes is demonstrated based on the specific inverse design. The device consists of two multimode 2 × 2 CB couplers (including mode converters, multimode interference couplers, and crossings) and a thermo‐optic (TO) phase shifter. It achieves extinction ratios exceeding 15 dB for all modes at the central wavelength of 1.55 µm. All the fundamental components are designed by an improved general shape optimization method, realizing a compact size and a larger manufacturing tolerance (±20 nm). Besides, a hydrogen‐doped indium oxide microheater is introduced as a TO phase shifter to achieve a fast response (≈3.5 µs in average) for all modes. This solution provides an effective avenue toward large‐scale multimode optical switch matrices for the future MDM systems.

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Broadband polarization/mode insensitive 3-dB optical coupler for silicon photonic switches

Cited by 7 publications

References 33 publications

Integrated Photonic Passive Building Blocks on Silicon-on-Insulator Platform

Integrated Photonic Passive Building Blocks on Silicon-on-Insulator Platform

Ultra-compact and broadband polarization-insensitive mode-order converting power splitter

Compact, Scalable, Fast‐Response Multimode 2 × 2 Optical Switch Based on Inverse Design

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